title: Determination of nongeometric effects: equivalence between Artmann's and Tamir's generalized methods.
abstract: This work shows that all first- and second-order nongeometric effects on propagation, total or partial reflection, and transmission can be understood and evaluated considering the superposition of two plane waves. It also shows that this description yields results that are qualitatively and quantitatively compatible with those obtained by Fourier analysis of beams with Gaussian intensity distribution in any type of interface. In order to show this equivalence, we start by describing the first- and second-order nongeometric effects, and we calculate them analytically by superposing two plane waves. Finally, these results are compared with those obtained for the nongeometric effects of Gaussian beams in isotropic interfaces and are applied to different types of interfaces. A simple analytical expression for the angular shift is obtained considering the transmission of an extraordinary beam in a uniaxial-isotropic interface.
authors.affiliation: Grupo de Láser, Óptica de Materiales y Aplicaciones Electromagnéticas (GLOmAe), Departamento de Física, Facultad de Ingeniería, Universidad de Buenos Aires, Av. Paseo Colón 850, C1063ACV Ciudad Autónoma de Buenos Aires, Argentina. lperez@fi.uba.ar
authors.forename: Liliana I
authors.initials: LI
authors.lastname: Perez
authors.forename: Rodolfo M
authors.initials: RM
authors.lastname: Echarri
authors.forename: María T
authors.initials: MT
authors.lastname: Garea
authors.forename: Guillermo D
authors.initials: GD
authors.lastname: Santiago